function changeVisibility(id)
{
	var id;
	vista = (document.getElementById(id).style.display == 'none') ? 'block' : 'none';
	document.getElementById(id).style.display = vista;

}

function suurennafonttia() {
	var alkulisays = 10;
	var edellinenlisays = parseInt(document.getElementById("zoomLevel").value);
	
	lisays = edellinenlisays + alkulisays;
	
	document.getElementById("container").style.fontSize="1"+lisays+"%";
	document.getElementById("zoomLevel").value = lisays;
	
	document.cookie = 'fonttikoko='+lisays+'; expires=Tue, 1 Sep 2020 00:00:00 UTC; path=/';
}

function pienennafonttia() {
	var alkulisays = 10;
	var edellinenlisays = parseInt(document.getElementById("zoomLevel").value);
	
	lisays = edellinenlisays - alkulisays;
	
	document.getElementById("container").style.fontSize="1"+lisays+"%";
	document.getElementById("zoomLevel").value = lisays;
}

function pidafonttikoko() {
	var fonttikoko = readCookie('fonttikoko');
	document.getElementById("container").style.fontSize="1"+fonttikoko+"%";
}

function readCookie(name) {
	var nameEQ = name + "=";
	var ca = document.cookie.split(';');
	for(var i=0;i < ca.length;i++) {
		var c = ca[i];
		while (c.charAt(0)==' ') c = c.substring(1,c.length);
		if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
	}
	return null;
}